Teleconvertor


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Feb 20, 2009
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#1
Hi all,

Want some advise on teleconvertor 2x(sigma). I only find the technical specification but not any detail review.
What is the actual usage of it and who uses it. I more interested in snapping nature wildlife(bird watch). I have a 70-300 lens(Sigma), i guess is not long enough to take any wildlife. Can the teleconvertor boost the distance to 600mm?

Cheers
 

zac08

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Feb 21, 2005
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#2
Hi all,

Want some advise on teleconvertor 2x(sigma). I only find the technical specification but not any detail review.
What is the actual usage of it and who uses it. I more interested in snapping nature wildlife(bird watch). I have a 70-300 lens(Sigma), i guess is not long enough to take any wildlife. Can the teleconvertor boost the distance to 600mm?

Cheers
You can.. but the max aperture is also reduced by 2 stops. So if the max aperture was f5.6... it's going to drop to f11... I don't think you can AF with such a small aperture. :sweat:
 

Feb 20, 2009
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CCK
#3
I read up that there will be an impact on the picture. How bad will it be, because i cannot find any picture to compare.

Advisable to get a teleconvertor?
 

zac08

Senior Member
Feb 21, 2005
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#4
I read up that there will be an impact on the picture. How bad will it be, because i cannot find any picture to compare.

Advisable to get a teleconvertor?
There will be slight degradation of the image quality. Effects depends on amount of light lost and also the brand and amount of TC used. 1.4 has the least, 1.7 has slightly more and 2 or 3 has the highest. And normally they are coupled with f2.8 lenses to reduce the image degradation amount...
 

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